ZKPQ focuses on biology and temperament. Unlike the Big Five, which describes social and cognitive traits, the Zuckerman-Kuhlman model measures psychobiological parameters like impulsivity and sensation seeking, which are directly linked to neurotransmitter activity.
Yes. Sensation-seeking scores often peak in late adolescence and then decline somewhat into the late 20s and beyond—patterns researchers connect with brain maturation and age-related changes in reward sensitivity (always with a lot of individual variation).
The full ZKPQ has solid psychometric support in the research literature. This shortened web version is an approximation. Where the full form includes infrequency (or validity) scales to flag careless or socially desirable responding, not all of that machinery may be present here—treat results as illustrative.